Suppose That, as It Evaporates in the Upper Atmosphere, a Raindrop's

Suppose that, as it evaporates in the upper atmosphere, a raindrop's diameter changes in one minute from one millimeter to one micrometer. Its diameter has decreased by a factor of

A) 10, i.e., it is one tenth of the initial size.
B) 100, i.e., it is one hundredth of the initial size.
C) 1,000 (or, 10³) , i.e., it is one thousandth of the initial size.
D) 1,000,000 (or, 10⁶) , i.e., it is one millionth of the initial size.